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#lang debug racket/base
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(require racket/runtime-path
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racket/string
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racket/path
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racket/match)
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(provide (all-defined-out))
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(define-runtime-path quadwriter-fonts-dir "fonts")
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(define-runtime-path default-font-face "fonts/source-serif/SourceSerifPro-Regular.otf")
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(define default-font-family "source-serif")
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(define default-font-size 12)
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(define default-line-height 16)
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(define font-paths (make-hash))
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(define (setup-font-path-table! base-path)
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;; populate `font-paths` table with font paths
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;; search "fonts" subdirectory in project for other subdirectories
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;; which are presumed to contain fonts.
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;; and link them to their family names & styles.
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;; this allows a flexible mapping from internal to external names, like @font-face
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;; note that all the semantics are derived from the file system
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;; not any metadata fields within the font.
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;; this is faster and easier, because you can just muck with the directory and filenames
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;; to change the font mapping.
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;; though it also creates the potential for mischief,
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;; if a font is named something that doesn't reflect its visual reality.
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;; but we are not the font police.
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(hash-clear! font-paths)
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(define-values (dir path _) (split-path base-path))
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(define doc-fonts-dir (build-path dir "fonts"))
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;; run doc-fonts-dir first because earlier fonts take precedence
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(for* ([fonts-dir (in-list (list quadwriter-fonts-dir doc-fonts-dir ))]
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#:when (directory-exists? fonts-dir)
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[font-family-subdir (in-directory fonts-dir)]
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#:when (directory-exists? font-family-subdir)
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[font-path (in-directory font-family-subdir)]
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#:when (member (path-get-extension font-path) '(#".otf" #".ttf")))
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(match-define (list font-path-string family-name)
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(map (λ (x) (path->string (find-relative-path fonts-dir x))) (list font-path font-family-subdir)))
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(define key
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(cons family-name
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(match (string-downcase font-path-string)
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[(and (regexp "bold") (regexp "it(alic)?")) 'bi]
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[(regexp "bold") 'b]
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[(regexp "it(alic)?") 'i]
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[_ 'r])))
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;; only set value if there's not one there already.
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;; this means that we only use the first eligible font we find.
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(hash-ref! font-paths key font-path)))
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(define (font-attrs->path font-family bold italic)
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;; find the font-path corresponding to a certain family name and style.
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(define key (cons font-family
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(cond
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[(and bold italic) 'bi]
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[bold 'b]
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[italic 'i]
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[else 'r])))
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(define regular-key (cons font-family 'r))
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(cond
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[(hash-ref font-paths key #false)]
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;; if there isn't one, try the regular style.
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[(hash-ref font-paths regular-key #false)]
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;; If there isn't one, use the default.
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[else default-font-face]))
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(define (resolve-font-path attrs)
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(define this-font-family (hash-ref! attrs 'font-family default-font-family))
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(define this-bold (hash-ref! attrs 'font-bold #false))
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(define this-italic (hash-ref! attrs 'font-italic #false))
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(hash-set! attrs 'font-path (font-attrs->path this-font-family this-bold this-italic)))
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(define (parse-percentage pstr)
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(/ (string->number (string-trim pstr "%")) 100.0))
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(define (resolve-font-size attrs)
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(define this-font-size (hash-ref! attrs 'font-size default-font-size))
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(define this-font-size-adjust (parse-percentage (hash-ref! attrs 'font-size-adjust "100%")))
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;; we bake the adjustment into the font size...
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(hash-set! attrs 'font-size (* this-font-size this-font-size-adjust))
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;; and then set the adjustment back to 100% (since it's now accounted for)
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(hash-set! attrs 'font-size-adjust "100%"))
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